error when Rails view renders a partial

[eostrom]

First off, I'm running Cucover on a Spree project, and a lot of the code is in an extension (like a plugin), not in RAILS_ROOT/app. I don't think that's an issue, but I thought I should mention it.

I get a lot of this error:

undefined method `filename' for nil:NilClass (ActionView::TemplateError)  
  cucover (0.1.4) lib/cucover/rails.rb:17:in `render'

The line is:

    filename = args[0][:file].filename

This seems to work fine for views and layouts rendered by the controller: args[0][:file] is a Template object that knows exactly what file it's rendering.

The problem is when the view in turn renders a partial. In this case, there's no :file, just :partial, and the value isn't a Template, it's just a string like "shared/footer". In some cases, args[0] isn't a hash at all, it's just a string.

I made Cucover get past this line with the following code:

    source = args[0]
    filename = if source[:file]
                 source[:file].filename
               elsif source[:partial]
                 source[:partial] =~ /[^\/]+$/
                 source[:partial].sub(/[^\/]+$/, "_#{$&}")
               else
                 source
               end

... but I suspect Cucover won't properly detect when files are changed, because it only has a string like "shared/footer" and not the actual path to the file that was rendered.